Telecommunications – Transmitter and receiver at separate stations
Patent
1995-03-20
1996-11-12
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 341, 455 541, 455 561, H04Q 700, H04Q 900
Patent
active
055749747
ABSTRACT:
In a cellular communication system, a method and apparatus are provided for allocating a channel for use on a connection between a base station and a mobile station in a cell, without making measurements of downlink interference. Throughout the system, uplink and downlink power levels are regulated so that, within each cell, their sum changes by an amount whose magnitude is substantially equal to the magnitude of change in path gain between the mobile station and the base station in that cell, and which sum is opposite in sign to the amount of change in path gain. This power regulation scheme assures that there will be a strong correlation between system-wide measurements of uplink and downlink interference. Therefore, with the power regulation scheme in place, each cell determines uplink carrier to interference (C/I) ratios for the free channels available for use in the cell and selects an acceptable free channel having a C/I value that is within a predetermined acceptable range. If uplink C/I on the acceptable free channel is greater than the uplink C/I value of a channel currently assigned to a connection, then an intra-cell handover is performed so that the connection will be reassigned to the acceptable free channel. This technique is useful for providing an adaptive channel allocation scheme to systems, such as analog cellular communications systems, in which downlink interference measurements cannot be made.
REFERENCES:
patent: 4613990 (1986-09-01), Halpern
patent: 4785450 (1988-11-01), Bolgiano et al.
patent: 5239682 (1993-08-01), Strawcynski et al.
patent: 5276730 (1994-01-01), Cimini, Jr. et al.
patent: 5276907 (1994-01-01), Meidan
patent: 5287544 (1994-02-01), Menich et al.
patent: 5305468 (1994-04-01), Bruckert et al.
patent: 5355514 (1994-10-01), Borg
patent: 5448750 (1995-09-01), Eriksson et al.
patent: 5491837 (1996-02-01), Haartsen
S. C. Chen et al., "On Distributed Power Control for Radio Networks", New Orleans Supercomm/ICC '94. Serving Humanity Through Communications. 1994 IEEE International Conference on Communications, pp. 1281-1285, vol. 3, May 1, 1994, New Orleans, Louisiana.
Y. Furuya & Y. Akaiwa, "Channel Segregation, A Distributed Adaptive Channel Allocation Scheme for Mobile Communication Systems", Second Nordic Seminar on Digital Land Mobile Radio Communication System, pp. 311-315, Oct. 1986, Stockholm, Sweden.
H. Eriksson & R. Bownds, "Performance of Dynamic Channel Allocation in the DECT System", Proceedings of 41st VTC, pp. 693-698, May 1991.
J. F. Whitehead, "Signal-Lever-Based Dynamic Power Control for Co-channel Interference Management", Proceedings of 43rd VTC, pp. 499-502, May 1993.
M. Almgren et al., "Capacity enhancements in a TDMA system", Proceedings of 43rd VTC, pp. 277-280, May 1993.
Almgren Knut M.
Andersson Claes H.
Frodigh Carl M.
Wallstedt Yngve K.
Arthur Gertrude
Eisenzopf Reinhard J.
Telefonaktiebolaget LM Ericsson
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